The narcotic ingredient in "Percs" (Percocet) is the same ingredient as in Endocet or Oxycontin. It is Oxycodone, a synthetic opioid with a longer half life than most opiates, excluding Methadone or Buprenorphine (Suboxone/Subutex). Before its popularity it was not detected in opiate drug screens because the standard opiate test did not detect it, due … Read more